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Succession of the Plant Communities of the Ustyurt Eastern Cliff (Republic of Uzbekistan) in Connection with Climate Change

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Journal of Environmental Protection 2018年第13期9卷 1408-1424页

作者： Adilov Bekhzod Rakhimova Tashkhonim Shomurodov Khabibullo Rakhimova Nodira Vokhidov Yusuf Institute of Botany AS RUz Tashkent Uzbekistan unitary enterprise “geoinform cadastre” Tashkent Uzbekistan

A decrease in the amount of precipitation is observed on average 18 - 20 mm compared with the periods before the Aral crisis and the average annual temperature rise over the long-term period is 2.0°C in the Central part of Ustyurt. An increase in the Si index meaning an increase in the degree of drought every ten-flight is clearly expressed in the months March-July. Data Analysis 1981-2017 shows that within 36 years the species diversity in the monitoring sites of Kabanbay decreased by 2 - 3 times. In 1981 the number of species fluctuated between the values of 9 - 50, and in 2017 this figure is 4 - 17. The results of the analysis show that the forecast indicators of the old-current state (1981) of the vegetation coverage and number of species were stable or had tendencies with a low regressive character (r2 = 0.01). However, the current-state (2017) of the vegetation coverage and the species composition of the monitoring plots showed a low progressive trend (r2 = 0.03), i.e. in the future, the formation of plant communities with low vegetation coverage and species composition has a dominant status. The results show that in 1981, 65% - 80% of the species composition of plant communities consisted of halophyte and xerophyte groups. In 2017, this figure reaches 80% - 100%, i.e. this claims to increase xerophytization and halophytization of territories. An interesting fact is established with mesophyte group. In general, theoretically, the decrease in the number of mesophyte group of plants for 1981-2017 would have a direct correlation with the vegetation coverage and their active share in it. However, for 36 years, their active share in the vegetation coverage remained unchanged—amounting to 0% - 20%. Of course, in these years, the decrease in the number of mesophyte plants led to an increase in the number of plant communities, in which the proportion of vegetation coverage of mesophyte group is insignificant—0% - 5%. Despite the drought, the active part of the vegetat

关键词： Ustyurt Plateau Eastern Cliff Climate Change Species Diversity Total Projective Cover Invasive Species

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Some Notes on the Key Botanical Territories of Ustyurt (Uzbekistan) and the Influence of Oil and Gas Industries on Them

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American Journal of Plant Sciences 2017年第11期8卷 2811-2824页

作者： Shomurodov Khabibullo Adilov Bekhzod Rakhimova Tashkhonim Rakhimova Nodira Aimuratov Rapat Vokhidov Yusuf Institute of Botany AS RUz Tashkent Uzbekistan Karakalpak Scientific Research Institute of Natural Sciences Nukus Republic of Karakalpakstan unitary enterprise “geoinform cadastre” Tashkent Uzbekistan

The paper presents data on the modern state of some important botanical territories of the Ustyurt plateau. Materials on the effect of dust rising from the main highway of the oil and gas sector on the vegetation cover of the adjacent areas studied are considered. The results of the analysis showed that the vitality of dominants and rare species along the road and closer to it is low, the projective coverage does not exceed 8%. Starting from 100 to 200 m, the vitality of the dominants improves. With a distance of 500 m from the roads, the species composition increases, the projective coverage reaches 12%. The evaluation of the vitality of dominant and/or endemic species, the comparison of the projective cover and the species diversity of the pilot site with the control plot, and also the method of weighing the annual shoots of dominant and/or rare species with all vegetative and generative elements in a comparative aspect give reliable results in determining the degree Anthropogenic impact on the vegetation cover of Ustyurt. Inclusion of dominants the restoration of vegetation by phytoremediation of the study area gives promising results.

关键词： Ustyurt Plateau Oil and Gas Sector Vegetation Cover Impact of Dust Particles

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Present State of Pasture Types of the Central Kyzylkum

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American Journal of Plant Sciences 2016年第4期7卷 677-683页

作者： Adilov Bekhzod Rakhimova Tashkhonim Rakhimova Nodira Alimova Rano Sagdiev Mirqosim Vakhidov Yusuf Institute of Gene Pool of Plants and Animals AS RUz Tashkent Uzbekistan Tashkent State Agrarian University Tashkent Uzbekistan unitary enterprise geoinform cadastre of Uzbekistan Tashkent Uzbekistan

The modern state of desert pastures of the Central Kyzylkum has been studied. The pasture territories of the Central Kyzylkum are distributed on sandy soils (14%), salt marshes (6%), gravellyloamy gray-brown soils (75%) and riparian nature-territorial complexes (5%). The main (75%) areas of pasture are occupied by the gravelly-loamy gray-brown soils which are dominated by species of sagebrushes. There are formed of 8 pasture types depending on the properties of natural complexes. The main type of pasture is sagebrushes (Mixto artemisieta), which occupy 60% of the pasture area, and then follow Peganeta harmala, Mixto calligoneta, Halocnemeta strobilacei, Tamariceta varia, Haloxyleta aphylli, Convolvuleta hamadae and Mixshrubs pasture types. The share of fodder plants is high (an average of 83%) in the flora of the study area. According to seasonal grazing, pastures of the Central Kyzylkum can be divided 5 groups: year-round, spring, spring-summer, autumn-winter and unsuitable pastures for grazing. Among them are prevail year-round grazing pastures. The numbers of annual plants and abundance venomous plants in the flora are indicators of pasture degradation in the study area. Annual plants may occupy 55% of composition of plant communities on degraded sites, besides the pasture types which formed under the influence of anthropogenic factors. In Central Kyzylkum newly formed and transformed pasture types occupy 25% of pastures.

关键词： Types of Pasture Venomous Plants Productivity Seasonal Use Degradation Indicators

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